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arXiv 0903.3178physics.soc-phphysics.data-anq-bio.QM
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链接社区揭示了网络的多尺度复杂性

Link communities reveal multiscale complexity in networks

Yong-Yeol Ahn, James P. Bagrow, Sune Lehmann

摘要:

网络已经成为理解相互作用对象系统的关键方法,统一了对包括生物有机体和人类社会在内的各种现象的研究。研究网络结构和动力学的一个关键步骤是识别社区:对应于功能亚基(如蛋白质复合物或社会领域)的相关节点组。网络中的社区经常重叠,使得节点同时属于几个组。同时,许多网络都具有层次结构,其中社区递归地分组为层次结构。然而,事实上,许多真实的网络具有普遍重叠的社区,其中每个节点都属于一个以上的组,其结果是节点的全局层次结构无法捕获重叠组之间的关系。在这里,我们重塑社区的链接,而不是节点的群体,并表明这种非正统的方法成功地调和了对立的组织原则重叠的社区和层次结构。与现有的文献相比,它完全集中在分组节点,链接社区自然纳入重叠,同时揭示层次结构。我们在许多网络中发现了相关的链接社区,包括主要的生物网络,如蛋白质-蛋白质相互作用和代谢网络,并表明一个大型的社会网络包含分层组织的社区结构,跨越市中心到区域尺度,同时保持普遍的重叠。我们的研究结果表明,链接社区是基本的构建块,揭示了重叠和层次组织在网络中是同一现象的两个方面。

英文摘要:

Networks have become a key approach to understanding systems of interacting objects, unifying the study of diverse phenomena including biological organisms and human society. One crucial step when studying the structure and dynamics of networks is to identify communities: groups of related nodes that correspond to functional subunits such as protein complexes or social spheres. Communities in networks often overlap such that nodes simultaneously belong to several groups. Meanwhile, many networks are known to possess hierarchical organization, where communities are recursively grouped into a hierarchical structure. However, the fact that many real networks have communities with pervasive overlap, where each and every node belongs to more than one group, has the consequence that a global hierarchy of nodes cannot capture the relationships between overlapping groups. Here we reinvent communities as groups of links rather than nodes and show that this unorthodox approach successfully reconciles the antagonistic organizing principles of overlapping communities and hierarchy. In contrast to the existing literature, which has entirely focused on grouping nodes, link communities naturally incorporate overlap while revealing hierarchical organization. We find relevant link communities in many networks, including major biological networks such as protein-protein interaction and metabolic networks, and show that a large social network contains hierarchically organized community structures spanning inner-city to regional scales while maintaining pervasive overlap. Our results imply that link communities are fundamental building blocks that reveal overlap and hierarchical organization in networks to be two aspects of the same phenomenon.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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